Which is the smallest taxonomic group that contains organisms of different species

Genus

The complete and correct hierarchy of taxonomic groups from largest to smallest are:

1) Domain

1.1) Archaea 1.2) Bactera 1.3) Eukarya

2) Kingdom

2.1) Animalia 2.2) Plantae 2.3) Fungi 2.4) Protista 2.5) Archaea 2.6) Bacteria

3) Phylum - has 35 phyla

4) Class

5) Order

6) Family

7) Genus

8) Species